“Thy friendship oft has made my heart to ache: do be my enemy for friendship's sake.”
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William Blake 249
English Romantic poet and artist 1757–1827Related quotes

From his own Dedicatory Epistle to his Poems & Ballads 1904.
Source: The Meaning of God in Human Experience (1912), Ch. XII : The Will as a Maker of Truth, p. 140.

As quoted in Beverley Male (1982) Revolutionary Afghanistan: A Reappraisal, page 183

The Nuts of Knowledge (1903)

“My fair one, let us swear
An eternal friendship.”
Act IV, sc. i
Le Bourgeois Gentilhomme (1670)